Relief valve



Sept. 3, 1935.

E. W. WORK RELIEF VALVE} Filed Aug. 31, 1933 INVENTOR ERNEST (ILL/ walfl Patented Sept. 3, 1935 g UNITED STATES PATENT oFFlcE RELIEF VALVE Ernest Willy Work, Toronto, Ontario, Canada Application August 31. 1933, Serial No. 687,723 In Canada March 10, 1933 2 Claims. (Cl. 137-53) This invention relates to a relief valve for preswhen the pressure rises above a predetermined sure systems and has for one of its objects the maximum. provision of a valve which will be simple in con- The valve seat is mounted on theflexible diastruction and positive in its action. phragm 4 and secured thereto by means of a lock- 5 Valves are provided on pressure systems to renut l t, the diaphragm being held in fixed posi- 5 lease the pressure when it rises above a predetion within the body I in any approved manner, termined maximum and heretofore it has been such as between the abutting surfaces of the body customary to maintain the valve disc on the valve 1 and the base 2 as illustrated in the drawing. seat by means of a spring adjusted to the proper The base s rm d w th a W l l5 which p tension which acts directly on the valve disc and Vided at its upp edge With a u de to p- 10 adjusted to maintain the valve disc on the valve P t the diaphragm When there is little 110 seat so that it will not be moved therefrom until pressure within the system, thereby pre the internal pressure of the pressure system rises distortion of the diap under t lead of above the predetermined maximum. Heretofore the Spring T e Valve disc 6 is located Within such valves have been constructed so that the the Well and Supported from the base y means 15 force of the spring presses the valve disc against Of a Spring 3 d engages With the p 0f the the valve seat and if there is no pressure in the Valve Seat When it is in Closed Position, e Spring system, the full tension of the spring will rest 8 preventing the Valve disc from falling a y from on the valve disc and if this condition exists for t e seat when the internal Pressure has fa len to any length of tim for example on heating a very low level and also permitting of the valve 20 systems in the summer) the pressure of the spring disc being manila-11y moved out Of engagement may vulcanize the disc to the seat preventing the therewith, the Valve disc being guided y u dvalve to open at the pressure for which it is set; mg member Variations of the P e W n for example a 1 Standard diaphragm valve the system will impart movement to the flexible having a diaphragm with a surface area of 2 diaphragm. the valve s at and va v d s m vin 25 square inches and set to release at lbs. is loaded therewith- The p in being ed t e ga e with a spring tension of 120 lbs. In case of no with the top of the disc guide and the p the pressure in the system, the full 60 lbs. press down distance Piece being formed W e s ou der on the valve disc which load will cause an adhe- II which engages with the n when the 30 sion of the valve to the seat, this being the main determined ssu is rea h d, th ap being 30 reason for valves sticking. One of the objects of locked in its Set position by t 109k hilt The my invention is to provide a valve which will over- Valve may be adjusted to Open at difieleht P eome t difficulty. sure by increasing or diminishing the distance be- Other and further objects and advantages of tween the cap and the Shoulder this being my invention n be apparent by referen e to the achieved by means of the adjustable screw cap following description and the accompanying The pressure of the compression Spring 7 drawing in which:- acting on the diaphragm may be adjusted by the The single figure is a vertical segtional View f compression screw 9 which is screw threaded a preferred construction thlOllgh the head of the main body. T116 00m- -i0 Like characters of reference refer to like parts Pression Screw 7 and the washer are each 40 throughout the e ifi tio and drawing rormed with a bore therethrough to permit of The relief valve illustrated in the drawing comthe entry of the distance Piece into the main prises a housing consisting of a main body .I, a body to g g Wlth the dlsc gmde base 2, an adjustable cap 3, an inlet port l2 and a The devlce Illustrated in the drawmg shows the discharge port '3 and having Within the body a valve in closed position, the valve being adjusted flexible diaphragm 4 responsive to pressure variaig gg g z g g gigg gjgf ggg gg ggg 9 3: -'o hin th b d ,an or'fice thro h a 'ai g and s f; structlure 5 termine whether valve is in proper working conp g y g dition either mechanical or manual force is exg g Zi ggi ggggi gi gg i zz fg2: i e gg erted on the stop I 0 to force it downwardly. This 50 moves the valve disc out of engagement with p a st t p sur wi h n the body and the lip l8 allowing the fluid in the system to esresisting t movement, a d spring 8, a pressure cape. As soon as the force is released from the adjusting screw 9 and an adjustable movable stop easing pin the disc will be returned to its closed II) which arrests the movement of the valve disc position by the pressure within the system. The

' variations of the pressure in the system act on excess pressure to escape.

While I have described the preferred construction of a valve embodying my invention it will be apparent that many variations may be made Without departing from the scope of my invention, all of which I claim in the appended claims.

Having thus fully described my invention what I claim as new and desire to secure by Letters Patent is:

1. A relief valve for pressure systems comprising a hollow body having an inlet opening for communication with the system and also having adischarge opening, a flexible diaphragm within the housing between said openings responsive to pressure variations within the system, a valve seat mounted on the diaphragm, a spring acting on the diaphragm against the pressure within the system, a sleeve threaded through the body, an abutment member for the spring abuttingly engaged by one end of said sleeve, said sleeve being adjustable to vary the pressure exerted by said spring,

acting against the pressure within the system, a valve disk for the valve seat normally held closed by the pressure within the system, a stop member freely slidable within the body and extending through said sleeve, said stop member being separate from but abuttingly engageable by the valve for unseating the same when the pressure within I the system exceeds a predetermined maximum,

. and a cap screwed upon the body and formed with an opening, said slidable stop having a reduced extension passing through said opening and projecting beyond the cap for manual actuation to move the valve disk away from the valve seat for the purpose of testing the functioning of the valve.

2. A relief valve for pressure systems comprising a hollow body having an inlet opening for communication-with the system and also having a discharge opening, a flexible diaphragm within the housing between said openings responsive to pressure variations within the system, a valve seat mounted on thediaphragm, a spring acting on the diaphragm against the pressure within the system,

an adjustable abutment member within the body reacting against said spring for varying the pressure exerted thereby against the pressure within the system, a valve disk for the valve seat held normally closed by the pressure within the syscap'having an opening therein, and said stop member having a reduced extension projecting through said opening and beyond the cap for manual actuation to unseat said valve for the purpose of testing the functioning of the valve,

said reduced extension defining a shoulder cooperating with the cap for limiting the sliding move ment of the stop member.

E. W. WORK. 

